bouncy selecting

In 2.70 I have problems when selecting mesh in edit mode. The selection is jumpy somehow - selects, deselects and probeably selects again, all with only one klick to the RMB, so as if the button itself is bouncing somehow. This mainly happens if there are more than one mesh element is close to the cursor and seemly blender can’t make a clear decision what to select and you can watch it how it makes it’s decisions.

Sometimes this is very annoing.
I got this issue already in an older blender version but since then there also was versions I didn’t even noticed this.

Anyone else got this problem and probeably an idea how to solve this ?
May be it’s some kind of OpenGL Problem related to my graphic card / driver (Radeon HD6850/Catalyst 14.4).

Greetings Martin